logical operators
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 | && and (logical) if [ $condition1 ] && [ $condition2 ] # Same as: if [ $condition1 -a $condition2 ] # Returns true if both condition1 and condition2 hold true... if [[ $condition1 && $condition2 ]] # Also works.|| or (logical) if [ $condition1 ] || [ $condition2 ] # Same as: if [ $condition1 -o $condition2 ] # Returns true if either condition1 or condition2 holds true... if [[ $condition1 || $condition2 ]] # Also works. # Note that || operator not permitted within [ ... ] construct. |
Example:
1 2 | X=1[ $X -ne 0 ] && echo "X isn't zero" || echo "X is zero" |
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